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RULESFOR THE CLASSIFICATION

AND CONSTRUCTION OF SEA-GOING SHIPS

PART IV

STABILITY AND SUBDIVISION

2010

GDASK

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RULES FOR THE CLASSIFICATION AND CONSTRUCTION OF SEA-GOING

SHIPS prepared and edited by Polski Rejestr Statkw, hereinafter referred to as PRS,

consist of the following Parts:

Part I Classification Regulations

Part II Hull

Part III Hull Equipment

Part IV Stability and Subdivision

Part V Fire Protection

Part VI Machinery Installations and Refrigerating Plants

Part VII Machinery, Boilers and Pressure Vessels

Part VIII Electrical Installations and Control Systems

Part IX Materials and Welding.

Part IV Stability and Subdivision, 2010, was approved by the PRS Board on

25 June 2010 and enters into force on 1 July 2010.

From the entry into force, the requirements ofPart IVStability and Subdivision apply,

in full, to new ships.

With respect to existing ships, the requirements ofPart IV Stability and Subdivision

are applicable within the scope specified inPart IClassification Regulations.

The requirements ofPart IV Stability and Subdivision are extended by the below-

listed Publications:

Publication No. 6/P Stability,

Publication No. 14/P Principles of Approval of Computer Programs,Publication No. 16/P Loading Guidance Information,

Publication No. 32/P The Requirements for the Stowage and Securing of Cargo

on Sea-going Ships,

Publication No. 66/P Onboard Computers for Stability Calculations,

Publication No. 76/P Stability, Subdivision and Freeboard of Passenger Ships

Engaged on Domestic Voyages,

Copyright by Polski Rejestr Statkw S.A., 2010

PRS/AW, 07/2010

ISBN 978-83-7664-116-4

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CONTENTSPage

1 General ........................................................................................................................ 71.1 Application .......................................................................................................... 7

1.2 General ................................................................................................................ 7

1.3 Definitions ........................................................................................................... 8

1.4 Documentation .................................................................................................... 11

1.5 Scope of Survey ................................................................................................... 13

1.6 General Requirements ......................................................................................... 14

1.6.1 General Assumptions and Principles ........................................................ 14

1.6.2 Calculation Methods ................................................................................ 15

1.6.3 Calculation of Hydrostatic Curves and Cross Curves of Stability ........... 15

1.6.4 Plans of Cargo Compartments, Tanks and Decks .................................... 17

1.6.5 The Arrangement Plan of Doors, Companionways and Sidescuttles ....... 17

1.6.6 Windage Area Calculations ...................................................................... 17

1.6.7 Effect of Free Surfaces of Liquids ........................................................... 18

1.6.8 Flooding Angle and Hull Watertight Integrity ......................................... 20

1.6.9 Loading Conditions .................................................................................. 20

1.6.10 Stability Curves ........................................................................................ 20

1.6.11 Stability Booklet and Stability Control Means ......................................... 21

1.6.12 Icing .......................................................................................................... 23

1.7 Inclining Test ....................................................................................................... 241.8 Stability Criteria .................................................................................................. 27

1.9 Departures from theRules and theRules Interpretations .................................... 28

1.10 Passage beyond the Specified Navigation Area ................................................ 28

1.11 Required Bow Height ....................................................................................... 28

2 Basic Requirements and Criteria ............................................................................. .29

2.1 Unrestricted Service Ships ................................................................................... 29

2.1.1 General ..................................................................................................... 29

2.1.2 Weather Criterion ..................................................................................... 29

2.1.3 Static Stability Curve ............................................................................... 322.1.4 Metacentric Height ................................................................................... 33

2.2 Restricted Service Ships ...................................................................................... 33

2.2.1 Weather Criterion ..................................................................................... 33

2.2.2 Static Stability Curve ............................................................................... 35

2.2.3 Metacentric Height ................................................................................... 36

3 Stability Detailed Requirements for Certain Types of Ships .............................. .37

3.1 Passenger Ships ................................................................................................... 37

3.2 Dry Cargo Ships .................................................................................................. 39

3.3 Container Ships ................................................................................................... 413.4 Tankers ................................................................................................................ 42

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3.5 Timber Carriers ................................................................................................... 43

3.6 Special Purpose Ships .......................................................................................... 45

3.7 Fishing Vessels .................................................................................................... 45

3.8 Tugs ..................................................................................................................... 46

3.9 Supply Vessels ..................................................................................................... 49

3.10 Ships Intended for the Carriage of Dangerous Bulk Cargoes .............................. 51

4 Stability Requirements for Technical Floating Units ............................................ .53

4.1 Floating Cranes .................................................................................................... 53

4.1.1 Application ............................................................................................... 53

4.1.2 Loading Conditions .................................................................................. 53

4.1.3 Stability Booklet ....................................................................................... 54

4.1.4 Calculation of Stability Characteristics ..................................................... 54

4.1.5 Calculation of Windage Area .................................................................... 54

4.1.6 Angle of Roll Calculation ......................................................................... 57

4.1.7 Icing........................................................................................................... 59

4.1.8 Stability of a Floating Crane in Working Condition ................................. 60

4.1.9 Stability of a Floating Crane During Passage within the Assigned

Navigation Area ........................................................................................ 62

4.1.10 Stability of a Floating Crane in Non-working Condition.......................... 63

4.1.11 Stability of a Floating Crane during Passage outside the Assigned

Navigation Area ....................................................................................... 63

4.2 Dredging Fleet ..................................................................................................... 644.2.1 Application ............................................................................................... 64

4.2.2 Working Conditions ................................................................................. 64

4.2.3 Loading Conditions .................................................................................. 64

4.2.4 Calculation of Cross Curves of Stability and Inclining Test .................... 65

4.2.5 Calculation of Stability in Working Conditions

and during Passages within the Assigned Area of Navigation ................. 65

4.2.6 The Effect of Liquid Cargoes ................................................................... 68

4.2.7 The Effect of Dredging Gear Icing ...........................................................